Suzuki DR650, Honda XL650/XR650 or the Buell, I guess
KTM and Husqvarna probably make some big single cyl bikes as well, check their websites. 
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Current: 2008 BMW 118d SE, 2002 Honda S2000, 2007 Honda CBR600RR
Previous: 2003 Z4 3.0i SMG, 1995 Aprilia RS250
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